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>35.7. Procedural Language Functions</A
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>    <SPAN
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>PostgreSQL</SPAN
> allows user-defined functions
    to be written in other languages besides SQL and C.  These other
    languages are generically called <I
CLASS="FIRSTTERM"
>procedural
    languages</I
> (<ACRONYM
CLASS="ACRONYM"
>PL</ACRONYM
>s).
    Procedural languages aren't built into the
    <SPAN
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>PostgreSQL</SPAN
> server; they are offered
    by loadable modules.
    See <A
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>Chapter 38</A
> and following chapters for more
    information.
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